If I had "everything" and this was my situation, I wouldn't worry too much about Color, "Cool" or Comfort quite yet.
I would be spending more time on putting it all together so that it all works and making it as acoustically correct as you can afford at this time with plans to make it even more acoustically correct with time and money.
I really don't recommend that you follow through on your plans to hang your audio monitors on the wall.
At minimum, they could vibrate the walls enough to create sound related issues and anomolies that you really don't want or need.
As you live in the UK, I suggest you read the current and 4 or 5 back issues of Sound On Sound Magazine and target their monthly Studio SOS articles.
You can get some great info there.
BG